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112 Corrosion Control Through Organic Coatings 13. Lindqvist, S.A., Corrosion, 41, 69, 1985. 14. Funke, W., Zorll, U. and Murthy, B.G.K., J. Coat. Technol., 68, 210, 1996. 15. Huldén, M. and Hansen, C.M., Prog. Org. Coat., 13, 171, 1985. 16. Ferlauto, E.C. et al., J. Coat. Technol., 66, 85, 1994. 17. Hare, C.H., J. Prot. Coat. Linings, 13, 59, 1996. 18. Lefebvre, D.R. et al., J. Adhesion Sci. Technol., 5, 210, 1991. 19. Perera, D.Y., Prog. Org. Coat., 44, 55, 2002. 20. Perera, D.Y and Vanden Eynde, D., J. Coat. Technol., 59, 55, 1987. 21. Prosser, J.L., Mod. Paint and Coat., 47, July 1977. 22. Sato, K. and Inoue, M., Shikizai Kyosaishi, 32, 394, 1959. (Summarized in Hare, C.H., J. Prot. Coat. Linings,13, 59, 1996.) 23. Perera, D.Y and Vanden Eynde, D., in Proc. Vol.1, XVIth FATIPEC Congress, Fédération d’Associations de Techniciens des Industries des Peintures, Vernis, Emaux et Encres d’Imprimerie de l’Europe Continentale (FATIPEC), Paris, 1982, 129. 24. Perera, D.Y., Prog. Org. Coat., 28, 21, 1996. 25. Perera, D.Y. and Vanden Eynde, D., in Proc. XXth FATIPEC Congress, Fédération d’Associations de Techniciens des Industries des Peintures, Vernis, Emaux et Encres d’Imprimerie de l’Europe Continentale (FATIPEC), Paris, 1990, 125. 26. Perera, D.Y., Stress phenomena in organic coatings, in Paint and Coatings Testing Manual, 14th ed. Of Gardner-Sward Handbook, Koleske, J.V., Ed., ASTM, Philadelphia, PA, 1995. 27. Leidheiser, H., Wang, W. and Igetoft, L., Prog. Org. Coat., 11, 19, 1983. 28. Funke, W., Ind. Eng. Chem. Prod. Res. Dev., 24, 343, 1985. 29. Miszczyk, A. and Darowicki, K., Prog. Org. Coat., 46, 49, 2003. 30. Maitland, C.C. and Mayne, J.E.O., Off. Dig., 34, 972, 1962. 31. Cherry, B.W. and Mayne, J.E.O., Proc. First International Congress on Metallic Corrosion, Butterworths, London. 1961. 32. Mayne, J.E.O., Trans. Inst. Met. Finish., 41, 121, 1964. 33. Cherry, B.W. and Mayne, J.E.O., Off. Dig., 37, 13, 1965. 34. Mayne, J.E.O., JOCCA, 40, 183, 1957. 35. Sampers, J., Polymer Degradation and Stability, 76, 455, 2002. 36. Carew, J. A. et al., Weathering performance of industrial atmospheric coatings systems in the Arabian Gulf, Proc. Corrosion ’94, NACE, Houston, 1994, Paper 445. 37. Rendahl, B., Igetoft, L. and Forsgren, A., Field testing of anticorrosion paints at sulphate and sulphite mills, in Proc. 9th International Symposium on Corrosion in the Pulp and Paper Industry, PAPRICAN, Quebec, 1998. 38. Özcan, M., Dehri, I. and Erbil, M., Prog. Org. Coat., 44, 279, 2002. 39. Morcillo, M. and Feliu, S., Quantitative data on the effect of atmospheric contamination in coatings performance, Proc. Corrosio i Medi Ambient, Universitat de Barcelona, Barcelona, 1986, 312. 40. Sixth Report of the Corrosion Committee, Special Report No. 66, Iron and Steel Institute, London, 1959. 41. Almeida, E.M., Pereira, D. and Ferreira, M.G.S., An electrochemical and exposure study of zinc rich coatings, in Proc. Advances in Corrosion Protection by Organic Coatings (Vol. 89-13), Scantlebury, D. and Kendig, M., Eds., The Electrochemical Society Inc., Pennington, 1989, 486. © 2006 by Taylor & Francis Group, LLC
7 Corrosion Testing — Background and Theoretical Considerations The previous chapter described the aging process of an organic coating, which leads to coating failure. The major factors that cause aging and degradation of organic coatings are UV radiation, moisture, heat, and chemical damage. Unfortunately for coating formulators, buyers, and researchers, aging and breakdown of a good coating on a well-prepared substrate takes several years to happen in the field. Knowledge about the suitability of a particular coating is, of course, required on a much shorter time span (usually “right now”); decisions about reformulating, recommending, purchasing, or applying a paint can often wait for a number of weeks or even a few months while test data is collected. Years, however, are out of the question. This explains the need for accelerated testing methods. The purpose of accelerated testing is to duplicate in the laboratory, as closely as possible, the aging of a coating in outdoor environments — but in a much shorter time. This chapter considers testing the corrosion-protection ability of coatings used in atmospheric exposure. The term ‘‘atmospheric exposure” is understood to include both inland and coastal climates, with atmospheres ranging from industrial to rural. Tests used for underwater or offshore applications are not within the scope of this chapter. A very brief explanation of some commonly used terms in corrosion testing of coatings is provided at the end of this chapter. 7.1 THE GOAL OF ACCELERATED TESTING The goal of testing the corrosion-protection ability of a coating is really to answer two separate questions: 1. Can the coating provide adequate corrosion protection? 2. Will the coating continue to provide corrosion protection over a long period? The first question is simple: Is the coating any good at preventing corrosion? Does it have the barrier properties, or the inhibitive pigments, or the sacrificial pigments to ensure that the underlying metal does not corrode? The second question is how will the coating hold up over time? Will it rapidly degrade and become useless? Or will it show resistance to the aging processes and provide corrosion protection for many years? © 2006 by Taylor & Francis Group, LLC 113
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Corrosion of Ceramic and Composite
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Published in 2006 by CRC Press Tayl
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Preface This book has been written
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Author Amy Forsgren received her ch
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Contents Chapter 1 Introduction ...
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1 Introduction This book is not abo
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